Chapter 22.

Question 1

Active tooth eruption

Answer 1

Emergence of crown into oral cavity.

Refers to the total lifespan of the tooth. — from beginning of crown development until tooth is lost or individual dies.

Question 2

Three stages of tooth eruption

Answer 2

Pre-eruption stage
Eruptive stage
Post-eruptive stage

Question 3

Pre-eruptive stage begins

Answer 3

As the crown starts to develop

Question 4

Movement in the pre-eruptive stage is of 2 varieties. What are they?

Answer 4

Spatial and eccentric

Question 5

Spatial movement

Answer 5

The crown develops while the bottom of the socket fills with bone, pushing the crown toward the surface.

Question 6

Eccentric movement

Answer 6

The crown of the tooth does not grow in a perfectly symmetrical pattern. The center of the tooth is shifting.

Question 7

Excentric movement is also called

Answer 7

Off center growth

Question 8

Eruptive stage also known as

Answer 8

Pre-functional eruptive stage

Question 9

Eruptive stage begins

Answer 9

With the development of the root

Question 10

During eruptive stage

Answer 10

The tooth breaks through the mucosal layer and emerges into the oral cavity.

Question 11

Eruptive stage continues until

Answer 11

Erupting teeth meet opposing teeth.

Question 12

Eruptive stage is

Answer 12

Occlusal and facial. More facial in the anterior than the posteriors

Question 13

Post-eruptive stage begins

Answer 13

When the teeth come into occlusion and continues until they are lost or death occurs

Question 14

Post-eruptive stage functions

Answer 14

In several ways

Question 15

During post-eruptive stage first

Answer 15

The mandible continues to grow and increase the space between maxilla and mandible. The teeth continue to erupt to maintain a balance in the arches

Question 16

During post-eruptive stage second

Answer 16

The teeth wear occlusally because of prolonged masticating stress and wear. They will continue to erupt to maintain tooth contact

Question 17

During post-eruptive stage third

Answer 17

Because there is slight interpersonal wear, there will be a slight medial eruptive Force that keeps the teeth in contact

Question 18

Finally during post-eruptive stage

Answer 18

If an opposing tooth is lost the tooth may continue to erupt in what is generally referred to as supraeruption which can cause serious problems in the replacement of the missing tooth because it makes it difficult to establish a normal occlusal plane

Question 19

Causes of tooth eruption

Answer 19

Root elongation
Alveolar bone formation and changes
Vascular pressure in dental tissues
The role of the tooth itself

Question 20

Root elongation

Answer 20

Increase in root length or root elongation forces the tooth into the oral cavity

Question 21

Alveolar bone formation and changes

Answer 21

Alveolar home growth, tooth development, and eruption are interdependent mechanisms

Question 22

Vascular pressure in dental tissues

Answer 22

Vascular pressures present enhance cellular activity but seem to have a direct eruptive role

Question 23

The role of the tooth itself

Answer 23

Plays little if any role in eruption because developing teeth have been surgically removed and replaced by metal or silicone implants into the dental sac and these implants have erupted

Question 24

Tooth eruption is definitely

Answer 24

Multifactorial

Question 25

Exfoliation

Answer 25

Shredding of primary dentition

Question 26

20 permanent teeth that follow the primary teeth develops as

Answer 26

Off-shoots of the primary dental laminate

Question 27

Anterior permanent teeth develop

Answer 27

Apically and lingually to the primary teeth

Question 28

Permanent premolars develop

Answer 28

Between the roots of the primary molars

Question 29

The pressure of a developing tooth is a major factor in

Answer 29

Resorption of primary teeth, but is not the only factor

Question 30

Reasons that primary teeth are retained beyond normal time of exfoliation

Answer 30

No permanent successor.
Ankylosis if primary tooth.
Permanent tooth does not erupt in its normal position and therefore does not cause resorption is the primary tooth root and roots.

Question 31

Ankylosis

Answer 31

Alveolar crest of born fuses in the cervical area of cementum of a resorting root of a tooth

Question 32

Retained root tips can be seen

Answer 32

In radiographs from time to time